WO2014104783A1

WO2014104783A1 - Structure of optical sheet for backlight unit

Info

Publication number: WO2014104783A1
Application number: PCT/KR2013/012258
Authority: WO
Inventors: 전기원; 이명수; 김영제; 고성국; 신성진; 최한울; 김태호; 성예정; 김지혜; 차은진
Original assignee: 미래나노텍 주식회사
Priority date: 2012-12-27
Filing date: 2013-12-27
Publication date: 2014-07-03
Also published as: KR102177219B1; TWI619976B; KR20140085357A; TW201430412A

Abstract

Disclosed is a structure of an optical sheet for a backlight unit. The optical sheet for a backlight unit according to the present invention comprises: an upper optical pattern layer on which optical pattern layers having a preset shape are arranged by a predetermined space; and a lower optical pattern layer which is formed beneath the upper optical pattern layer, and on which optical pattern layers having a preset shape are arranged by a predetermined space. The line of the horizontal direction or vertical direction in which the optical patterns of the lower optical pattern layer are arranged by a predetermined space forms a preset tilting angle with respect to the corresponding line of the horizontal direction or vertical direction in which the optical patterns of the upper optical pattern layer are arranged by a predetermined space.

Description

Structure of the optical sheet for the backlight unit

The present invention relates to a backlight unit, and more particularly, to a structure of an optical sheet for a backlight unit in which an upper optical pattern layer and a lower optical pattern have a preset tilting angle.

In the liquid crystal display, a backlight unit for injecting light into the LCD panel should be used. As a result, in order to improve the display quality and viewing angle of the LCD, the overall performance of the LCD depends not only on the performance of the panel itself but also on the improvement of the performance of the backlight unit.

As the backlight unit, not only a light source for emitting light but also a functional optical sheet having an array lens shape or a prism shape for improving optical characteristics of the backlight unit, for example, brightness.

As the price competitiveness of the optical market is intensified, the development of an array type lens capable of maximizing the yield in the process of replacing the lens and the two-layer structure of the lens, prism, and diffusion layer, which are the structures of the conventional optical sheet, with the lens and the two-layer structure However, a problem arises in that the moire phenomenon between the array arrays generated in the process is intensified.

In addition, there is a problem in that a moire phenomenon between a pattern and a liquid crystal pixel occurs when an array type sheet is used to rise to a top layer.

Therefore, to solve the problems of the prior art, an object of the present invention is implemented by the upper optical pattern layer and the lower optical pattern layer formed so that the predetermined optical pattern is arranged at a constant interval, the upper optical pattern layer and the lower optical pattern layer To provide a structure of an optical sheet for the backlight unit to have a predetermined tilting angle.

Another object of the present invention is to form an upper optical pattern layer and a lower optical pattern layer having a predetermined tilting angle, and having a size larger than the first optical pattern between the first optical pattern arranged at regular intervals on the optical pattern layer The present invention provides a structure of an optical sheet for a backlight unit to arrange an optical pattern in a predetermined form.

Still another object of the present invention is to form an upper optical pattern layer and a lower optical pattern layer having a predetermined tilting angle, and to apply a predetermined adhesive resin to an optical pattern formed on the lower optical pattern layer. To provide structure.

Another object of the present invention is to provide a structure of an optical sheet for a backlight unit to form the upper optical pattern layer and the lower optical pattern layer to have a predetermined tilting angle, to apply a filler resin to the optical pattern formed on the optical pattern layer It is.

However, the object of the present invention is not limited to the above-mentioned matters, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above objects, an optical sheet for a backlight unit according to an aspect of the present invention comprises an upper optical pattern layer formed to be arranged at regular intervals in the optical pattern of a predetermined shape on the top; And a lower optical pattern layer formed below the upper optical pattern layer, and formed to have an optical pattern layer having a predetermined shape disposed thereon at regular intervals, wherein the optical patterns of the upper optical pattern layer are arranged at regular intervals. The optical pattern of the lower optical pattern layer corresponding to the line in the horizontal or vertical direction is formed to have a predetermined tilting angle with the horizontal or vertical line arranged at regular intervals.

Preferably, the optical pattern is any one of a hemispherical lens, a cone-shaped lens, a prism.

Preferably, the optical pattern formed on the upper optical pattern layer and the optical pattern formed on the lower optical pattern layer are characterized in that the same shape.

Preferably, the diameter or height of the optical pattern formed on the upper optical pattern layer and the diameter or height of the optical pattern formed on the lower optical pattern layer are formed to be the same.

Preferably, the diameter or height of the optical pattern formed on the upper optical pattern layer is different from the diameter or height of the optical pattern formed on the lower optical pattern layer.

Preferably, each of the upper optical pattern layer or the lower optical pattern layer is arranged with a predetermined optical pattern at a predetermined interval, characterized in that the auxiliary optical pattern is arranged in a predetermined arrangement form between the optical pattern.

Preferably, the auxiliary optical pattern is characterized in that at least one or more optical patterns are formed in a modified or combined size.

Preferably, the auxiliary optical pattern is characterized in that at least one of the diameter or height is formed larger than the optical pattern.

Preferably, an adhesive resin having a predetermined degree of adhesion is added to the optical pattern formed on the lower optical pattern layer.

Preferably, filler resin is added to the optical pattern formed on the upper optical pattern layer or the lower optical pattern layer.

Preferably, the optical pattern formed in the upper optical pattern layer and the optical pattern formed in the lower optical pattern layer is characterized in that the other form.

Preferably, a cone-shaped lens is formed on the upper optical pattern layer, and a prism is formed on the lower optical pattern layer.

Preferably, the preset tilting angle is set to 6 to 8 ° when the diameter of the optical pattern formed on each of the upper optical pattern layer and the lower optical pattern layer is 16 to 25 μm.

Preferably, the preset tilting angle is set to 6 to 18 ° when the diameter of the optical pattern formed on each of the upper optical pattern layer and the lower optical pattern layer is 26 to 35 μm.

Preferably, the preset tilting angle is set to 20 to 25 ° when the diameter of the optical pattern formed on each of the upper optical pattern layer and the lower optical pattern layer is 36 to 45 μm.

According to another aspect of the present invention, an optical sheet for a backlight unit may include: an upper optical pattern layer formed such that a lens having a hemispherical shape or a cone shape is disposed at regular intervals; And a lower optical pattern layer formed below the upper optical pattern layer, the upper optical pattern layer being formed such that hemispherical or cone shaped lenses are disposed at regular intervals, wherein the lenses of the upper optical pattern layer are arranged at regular intervals. The lens of the lower optical pattern layer corresponding to the line in the direction or the vertical direction is formed to have a predetermined tilting angle with the line in the horizontal or vertical direction arranged at regular intervals.

According to another aspect of the present invention, an optical sheet for a backlight unit includes: an upper optical pattern layer formed such that cone-shaped lenses are disposed at regular intervals thereon; And a lower optical pattern layer formed under the upper array lens sheet and having a prism disposed thereon at regular intervals, wherein the lenses of the upper optical pattern layer are arranged in a constant interval in a horizontal or vertical direction. The prism of the lower optical pattern layer corresponding to the line may be formed to have a predetermined tilting angle with a line in a horizontal or vertical direction arranged at regular intervals.

Through this, the present invention is implemented by the upper optical pattern layer and the lower optical pattern layer formed so that the predetermined optical pattern is arranged at regular intervals, the moire phenomenon by having the upper optical pattern layer and the lower optical pattern layer to have a preset tilting angle. It is possible to avoid and to simplify the structure to improve the productivity of the optical sheet product, there is an effect that can implement a higher level of brightness than conventional optical sheet products.

In another aspect, the present invention is formed by the upper optical pattern layer and the lower optical pattern layer having a predetermined tilting angle, the second optical having a larger size than the first optical pattern between the first optical pattern arranged at regular intervals on the optical pattern layer By arranging the pattern in a predetermined form, wet out phenomenon caused by static electricity during the assembly process of the backlight unit can be reduced, and defects due to wet out phenomenon can be reduced, thereby improving mass productivity.

In addition, the present invention is formed to have a predetermined tilting angle of the upper optical pattern layer and the lower optical pattern layer, by applying a predetermined adhesive resin to the optical pattern formed on the lower optical pattern layer, there is an effect that can increase the adhesive force.

In addition, the present invention is formed to have a predetermined tilting angle of the upper optical pattern layer and the lower optical pattern layer, by applying a filler resin to the optical pattern formed on the optical pattern layer, thereby improving the luminance limit that can be raised to the refractive index of the resin It can be effective.

1 is a first view showing the structure of an optical sheet for a backlight unit according to an embodiment of the present invention.

2A to 2B are diagrams for describing an optical pattern layer according to an embodiment of the present invention.

3 is a view for explaining the arrangement of the array lens according to an embodiment of the present invention.

4A to 4B are views for explaining the shape of an array lens according to an exemplary embodiment of the present invention.

5A to 5B are views for explaining the shape of an optical pattern layer according to an embodiment of the present invention.

6A to 6C are first drawings for describing the shape of an optical sheet according to an embodiment of the present invention.

7A to 7C are second views for explaining the form of an optical sheet according to an embodiment of the present invention.

8 is a view for showing the luminance of the optical sheet according to an embodiment of the present invention.

9A to 9B are first drawings for describing an optical pattern layer according to an embodiment of the present invention.

10 is a view for explaining the shape of the second array lens according to an embodiment of the present invention.

11A to 11B are second diagrams for describing an optical pattern layer according to an embodiment of the present invention.

12A to 12B are views for explaining the shape of an array lens according to an embodiment of the present invention.

13A to 13B are first views illustrating an arrangement of a second array lens according to an exemplary embodiment of the present invention.

14A to 14B are second views for explaining an arrangement of a second array lens according to an exemplary embodiment of the present invention.

15 is a second view illustrating a structure of an optical sheet for a backlight unit according to an embodiment of the present invention.

16A to 16B are diagrams for describing an optical pattern layer according to an embodiment of the present invention.

17 is a third view for explaining the form of an optical sheet according to an embodiment of the present invention.

18A to 18B illustrate moiré avoidance of an optical sheet according to an embodiment of the present invention.

19 is a view for explaining a bonding principle of an optical sheet according to an embodiment of the present invention.

Hereinafter, a structure of an optical sheet for a backlight unit according to an embodiment of the present invention will be described with reference to the accompanying drawings. It will be described in detail focusing on the parts necessary to understand the operation and action according to the present invention.

In addition, in describing the components of the present invention, different reference numerals may be given to components having the same name according to the drawings, and the same reference numerals may be given even though they are different drawings. However, even in such a case, it does not mean that the corresponding components have different functions according to the embodiments, or does not mean that they have the same functions in different embodiments, and the functions of the respective components may be implemented. Judgment should be made based on the description of each component in the example.

Particularly, in the present invention, although the upper optical pattern layer and the lower optical pattern layer are formed so that the predetermined optical patterns are arranged at regular intervals, the new optical sheet has a tilting angle between the upper optical pattern layer and the lower optical pattern layer. Suggest a structure.

Further, in the present invention, the upper optical pattern layer and the lower optical pattern layer is formed to have a predetermined tilting angle, the second having a larger size than the first optical pattern between the first optical pattern arranged at regular intervals on the optical pattern layer The optical pattern may be disposed in a predetermined form, the preset adhesive resin may be applied to the optical pattern formed on the lower optical pattern layer, or the filler resin may be applied to the optical pattern formed on the optical pattern layer.

Here, the optical pattern may be a concept encompassing a hemispherical lens, a cone lens, a prism, and the like. The optical patterns formed on the upper optical pattern layer and the lower optical pattern described in the present invention may be formed in the same or different shapes or sizes.

As shown in FIG. 1, an optical sheet for a backlight unit according to the present invention may include an upper optical pattern layer 110, a lower optical pattern layer 120, and the like, in which optical patterns of the same type are formed. . Here, the optical pattern may represent a hemispherical lens and a cone-shaped lens.

An optical pattern having the same shape may be formed on the upper optical pattern layer 110 and the lower optical pattern layer 120 of the optical sheet. For example, both the upper optical pattern layer 110 and the lower optical pattern layer 120 may have a hemispherical lens or a cone-shaped lens.

The upper optical pattern layer 110 may be formed such that optical patterns of the same size are arranged at regular intervals so as to have a regular shape on the base film.

The lower optical pattern layer 120 may be formed such that optical patterns of the same size are arranged at regular intervals so as to have a regular shape on the base film.

In this case, the upper optical pattern layer 110 has a predetermined tilting angle with the upper optical pattern around a horizontal reference line or a vertical reference line which is the same line in which the optical patterns of the lower optical pattern layer 120 are arranged in a line. It can be formed at an angle.

In addition, the lower optical pattern layer 120 has a predetermined tilting angle with the upper optical pattern around a horizontal line or a vertical line which is the same line in which the optical patterns of the upper optical pattern layer 110 are arranged in a line. It may be formed to be inclined to have.

In this case, the preset tilting angle between the upper optical pattern layer 110 and the lower optical pattern layer 120 may be set differently according to the size or shape of the optical pattern formed thereon.

For example, in the case of the same array lens having a hemispherical diameter of 16 to 25 μm, the tilt angle is set to 6 to 8 °, and in the case of the same array lens having a diameter of 26 to 35 μm, the tilt angle is 16 to 18. It is set to °, and in the case of the same lane lens having a diameter of 36 ~ 45㎛ is set to 20 ~ 25 °.

In addition, in the case of a cone-shaped array lens, it is set to 1 to 3 ° regardless of the size of the diameter.

The upper optical pattern layer 110 and the lower optical pattern layer 120 are formed to have a predetermined tilting angle in order to remove the moire phenomenon.

As shown in FIGS. 2A to 2B, the optical pattern layer according to the present invention may represent the upper optical pattern layer 110 or the lower optical pattern layer 120, respectively.

In FIG. 2A, a plan view of the optical pattern layer is shown. It can be seen that array lenses 130 having the same size are arranged in a row at the same interval on the same line.

2B shows a perspective view of the optical pattern layer. For example, it can be seen that array lenses 130 of the same size having a hemispherical shape are arranged in a line on the same line.

As shown in FIG. 3, in the optical pattern layer, array lenses of the same size are arranged in a row at equal intervals on the same line, and array lenses arranged on different same lines may be arranged in a zigzag material.

For example, array lenses a1, a2, a3, ... are arranged in a line on the horizontal line H_line1, and array lenses b1, b2, b3, ... are arranged in a line on the horizontal line H_line2. The array lens b1 is positioned between the array lenses a1 and a2, and the array lens b2 is arranged in a zigzag form between the array lenses a2 and a3, respectively.

The reason for arranging the array lenses arranged in the adjacent horizontal lines in a zigzag form is to minimize the space formed between the adjacent array lenses. This arrangement allows the optical sheet of the present invention to improve luminance efficiency.

Referring to FIG. 4A, when implemented in a hemispherical shape, the array lens is formed to have the same size in the hemispherical shape on the optical pattern layer. The size of each array lens, that is, the diameter r has a range of 20 to 80 μm, The height h may be formed to have a size in the range of 10 to 40 μm, that is, 50% of the diameter.

Referring to FIG. 4B, in the case of the cone type, the array lens is formed in the same size as the cone shape on the optical pattern layer. The size of each array lens, that is, the first diameter r1 of the long axis is 20 to It has a range of 80 μm, the second diameter r2 of the short axis has a range of 10 to 75 μm so as to be smaller by 5 to 10 μm than the first diameter, the height h is in the range of 10 to 40 μm, It can be formed to have a size of 50% of one diameter.

For example, when the first diameter r1 is formed to 20㎛, the second diameter is formed to be 10 ~ 15㎛.

Referring to FIG. 5A, the optical pattern layer according to the present invention may be arranged such that the array lenses 130 are arranged at regular intervals, and the array lenses 130 having the same size in the hemispherical shape are arranged at regular intervals.

In this case, the size, that is, the diameter or the height of the array lens 130 may be changed as necessary.

Here, a plan view of an optical pattern layer in which hemispherical array lenses are arranged is shown.

Referring to FIG. 5B, the optical pattern layer according to the present invention may be arranged such that the array lenses 140 having the same size in the shape of cones have a predetermined interval. The bottom surface of the array lens 140 formed in the shape of a cone may be formed, for example, in the form of a hexagon, and a vertex portion thereof may be formed in a round shape.

Here, a plan view of an optical pattern layer in which cone-shaped array lenses are arranged is shown.

Referring to FIG. 6A, an array lens 130 having a diameter of 20 μm is formed on an upper optical pattern layer 110 and an array lens 130 having a diameter of 20 μm on a lower optical pattern layer 120 according to the present invention. ) Is formed but the size and shape of the array lens is the same, the vertical line or horizontal line in which the array lens 130 formed on the upper optical pattern layer 110 and the lower optical pattern layer 120 are arranged at regular intervals It has a predetermined tilting angle α between the lines in the direction.

6B, an array lens 130 having a diameter of 30 μm is formed on the upper optical pattern layer 110 and an array lens 130 having a diameter of 30 μm on the lower optical pattern layer 120 according to the present invention. ) Is formed but the size and shape of the array lens is the same, the vertical line or horizontal line in which the array lens 130 formed on the upper optical pattern layer 110 and the lower optical pattern layer 120 are arranged at regular intervals It has a predetermined tilting angle α between the lines in the direction.

Referring to FIG. 6C, the cone type array lens 140 is formed on the upper optical pattern layer 110 and the cone type array lens 140 is formed on the lower optical pattern layer 120. Are formed in the same size and shape so that the array lenses 140 formed on the upper optical pattern layer 110 and the lower optical pattern layer 120 are arranged in a vertical line or a horizontal line in a predetermined interval. It has a tilting angle α.

Referring to FIG. 7A, an array lens 131 having a diameter of 20 μm is formed on an upper optical pattern layer 110 and an array lens 132 having a diameter of 30 μm on a lower optical pattern layer 120 according to the present invention. ) Is formed to have a different size and shape of the array lens, and the vertical lines in which the

array lenses

131 and 132 formed on the upper optical pattern layer 110 and the lower optical pattern layer 120 are arranged at regular intervals, or The tilt angle α is set between lines in the horizontal direction.

Here, the case in which the array lens 131 formed on the upper optical pattern layer 110 is formed smaller than the size of the array lens 132 formed on the lower optical pattern layer 120 is illustrated.

Referring to FIG. 7B, an array lens 131 having a diameter of 30 μm is formed on the upper optical pattern layer 110 and an array lens having a diameter of 20 μm on the lower optical pattern layer 120 according to the present invention. 32 is formed to form a different size and shape of the array lens, a vertical line or a horizontal line in which the array lens formed on the upper optical pattern layer 110 and the lower optical pattern layer 120 are arranged at regular intervals The tilt angle α is set.

Here, the case in which the array lens 131 formed on the upper optical pattern layer 110 is formed larger than the size of the array lens 132 formed on the lower optical pattern layer 120 is shown.

Referring to FIG. 7C, the cone type array lens 141 is formed on the upper optical pattern layer 110 and the cone type array lens 142 is formed on the lower optical pattern layer 120. Is formed differently in size and shape, and the predetermined tilting angle α between the vertical lines or the horizontal lines in which the array lenses formed on the upper optical pattern layer 110 and the lower optical pattern layer 120 are arranged at regular intervals. Will have

Here, the case in which the array lens 141 formed on the upper optical pattern layer 110 is formed smaller than the size of the array lens 142 formed on the lower optical pattern layer 120 is illustrated.

Herein, the case in which only the diameter of the array lens formed on the upper optical pattern layer and the diameter of the array lens formed on the lower optical pattern layer is different from each other is described. However, the present invention is not limited thereto and the diameter or height of the array lens is different from each other. Can be formed.

In other words, it is preferable that any one of the diameter or height of the array lens formed on the upper optical pattern layer and any one of the diameter or height of the array lens formed on the lower optical pattern layer are formed differently, that is, larger or smaller.

As shown in FIG. 8, the two-sheet optical sheet according to the present invention has about 95% or more of the three-piece structure compared with the conventional structure consisting of a diffuser, a prism, and a lens. It shows luminance performance.

And it shows better luminance performance than the existing two-layer structure using non-array lens.

On the other hand, the optical member of the array type according to the present invention is a wet out phenomenon occurs, the structure of the optical member layer for preventing such a wet out phenomenon will be described.

9A to 9B, the optical pattern layer according to the present invention may represent each of the first optical pattern layer 110 or the second optical pattern layer 120, and is formed in the same shape.

In this case, a second array lens 130a having a larger size than the first array lens 130 is arranged between the regularly arranged first array lenses 130, which is an upper optical pattern layer and a lower optical. This is to minimize the wet out phenomenon caused by the adhesion between the pattern layers.

9A illustrates a plan view of an optical pattern layer, in which first array lenses 130 of the same size are arranged in a row at equal intervals on the same line to form a main pattern, and are sized between the first array lenses 130. It can be seen that the large second array lens 130a is arranged to form an auxiliary pattern.

9B illustrates a perspective view of an optical pattern layer, in which a first array lens 130 having a hemispherical shape having the same size is arranged in a row on the same line, but having a large size between the first array lenses 130. It can be seen that the array lens 130a is disposed.

In this case, the second array lens may be formed of one first array lens. For example, only the height of the second array lens may be greater than that of the first array lens. In addition, the second array lens may be formed to have a large size in which a plurality of first array lenses are combined, for example, a diameter and a height.

The second array lens according to the present invention thus formed is preferably formed in a size that is combined with 1 to 6 first array lenses. More preferably, in the second array lens according to the present invention, three first array lenses are combined. This is because the effect of the optical brightness phenomenon can be seen in the big pattern combined with the three patterns.

As shown in FIG. 10, the second array lens according to the present invention is formed by combining three first array lenses, and four corner portions may be formed in a round triangular pyramid shape. That is, the horizontal cross-sectional area may gradually decrease in the height direction.

In addition, each of the three side surfaces of the second array lens in which the four nipple portions are formed in the shape of a round triangular pyramid may be formed such that the central portion thereof is concave.

11A to 11B, the optical pattern layer according to the present invention may represent each of the first optical pattern layer 110 or the second optical pattern layer 120, and is formed in the same shape.

In FIG. 11A, a plan view of an optical pattern layer is shown, in which first array lenses 140 of the same size are arranged in a line at equal intervals on the same line to form a main pattern, and are sized between the first array lenses 140. It can be seen that the large second array lens 140a is arranged to form an auxiliary pattern.

In this case, the bottom surface of the first array lens formed in the shape of a cone may be formed in, for example, a hexagonal shape, and its vertex portion may be formed in a round shape.

In FIG. 11B, a perspective view of an optical pattern layer is shown, in which first array lenses 140 of the same size having a cone type are arranged in a line on the same line and are sized between the first array lenses 140. It can be seen that the large second array lens 140a is disposed.

In this case, the second array lens may be formed of one first array lens. For example, only the height of the second array lens may be greater than that of the first array lens. In addition, the second array lens may be formed to have a large size in which a plurality of first array lenses are combined, for example, a diameter and a height. It is preferable that the second array lens according to the present invention is formed in a size in which one to six first array lenses are combined.

Here, although the hemispherical shape or the cone shape is described as an example of the array lens according to the present invention, the present invention is not limited thereto and may be formed in various forms.

Referring to FIG. 12A, when implemented in the hemispherical shape, the first array lens is formed on the optical pattern layer with the same size in the hemispherical shape, and a second array lens having a large size is formed therebetween. It may be formed to have a height difference h larger than the first array lens by a range of 1 μm to 15 μm. More preferably, the second array lens may be formed to have a height difference h larger than that of the first array lens by a range of 3 μm.

In addition, the second array lens may have a height h within a range of at least 12 μm to at most 14 μm so that the second array lens is larger than the first array lens, and particularly preferably 13 μm.

Referring to FIG. 12B, when implemented in the form of a cone, the first array lens is formed on the optical pattern layer with the same size in the form of a cone, and a second array lens having a large size is formed therebetween. As in the case of implementation in the form, the second array lens may be formed to have a height greater than that of the first array lens by 1 μm to 15 μm.

Referring to FIG. 13A, the first optical pattern layer according to the present invention is arranged such that the first array lenses 130 having the same size in the hemispherical shape are arranged at regular intervals, and the second array lenses are disposed between the first array lenses 130. 130a may be regularly arranged to form a rhombus shape.

Referring to FIG. 13B, the first optical pattern layers according to the present invention are arranged to form a rhombus, and the distance dx between the second array lenses P1 and P3 positioned on the same horizontal line is 100 μm to 4000 μm. The distance dy between the second array lenses P2 and P4, which is formed on the same vertical line and is located on the same vertical line, is preferably formed to be 100 µm to 4000 µm.

Referring to FIG. 14A, the first optical pattern layer according to the present invention is arranged such that the first array lenses 130 having the same size in the hemispherical shape are arranged at regular intervals and between the first array lenses 130. 130a may be regularly arranged to form a square shape.

Referring to FIG. 14B, the first optical pattern layers according to the present invention are arranged to form a square shape, and the distance dx between the second array lenses P1 and P2 positioned on the same horizontal line is 100 μm to 4000 μm. The distance dy between the second array lenses P3 and P4, which is formed on the same vertical line and is located on the same vertical line, is preferably formed in a range of 100 µm to 4000 µm.

Here, although the rhombus shape and the square shape are described as an example of the arrangement of the second array lens according to the present invention, the present invention is not limited thereto and may be formed in various shapes.

As shown in FIG. 15, the optical sheet for the backlight unit according to the present invention may include an upper optical pattern layer 110 and a lower optical pattern layer 120 having different optical patterns formed thereon. . Here, the optical pattern may represent a cone-shaped lens pattern and a prism pattern.

Different types of optical patterns may be formed on the upper optical pattern layer 110 and the lower optical pattern layer 120 of the optical sheet. For example, a cone-shaped lens pattern may be formed on the upper optical pattern layer 110, and a prism pattern may be formed on the lower optical pattern layer 120.

The upper optical pattern layer 110 may be formed such that lens patterns having the same sized cone shape are arranged at regular intervals so as to have a regular shape on the base film.

The lower optical pattern layer 120 may be formed such that prism patterns of the same size are arranged side by side at regular intervals so as to have a regular shape on the base film.

In this case, the upper optical pattern layer 110 has a top optical pattern and a predetermined tilting angle α around the horizontal reference line or the vertical reference line which are the same lines in which the optical patterns of the lower optical pattern layer 120 are arranged in a line. It can be formed to be inclined to have.

In FIG. 16A, the upper optical pattern layer is shown. It can be seen that the cone-shaped array lenses 140 having the same size are arranged in a line at the same interval on the same line.

In FIG. 16B, the lower optical pattern layer is shown. It can be seen that the prism patterns 140 having the same size having a triangular shape are arranged side by side on the same line.

In this case, the prism pattern 140 may be continuously arranged on the optical pattern layer, but the present invention is not limited thereto, and the prism pattern 140 may be spaced apart by a predetermined distance interval.

17A to 17B are diagrams for describing a shape of an optical sheet according to an embodiment of the present invention.

Referring to FIG. 17A, the cone-shaped array lens 140 is formed on the upper optical pattern layer 110 and the prism pattern 150 is formed on the lower optical pattern layer 120. The array lens 140 of the array direction and the length direction of the prism pattern 150 may be formed to be parallel to each other. The array lens 140 and the prism 150 formed on the upper optical pattern layer 110 and the lower optical pattern layer 120 have a predetermined tilting angle α between vertical lines or horizontal lines arranged at regular intervals. do.

Referring to FIG. 17B, the cone-shaped array lens 140 is formed on the upper optical pattern layer 110 and the prism pattern 150 is formed on the lower optical pattern layer 120. The array lens 140 may be formed so that the direction in which the array direction and the length direction of the prism pattern 150 cross each other. The array lens 140 and the prism 150 formed on the upper optical pattern layer 110 and the lower optical pattern layer 120 have a predetermined tilting angle α between vertical lines or horizontal lines arranged at regular intervals. do.

In this case, in order to avoid the tilting operation during the manufacturing process of the optical sheet according to the present invention, the pattern is imprinted to have a preset tilting angle in the soft mold itself so as to have a tilting angle without a separate tilting process in the final product production. Can be formed.

Referring to FIG. 18A, the cone-shaped array lens is formed at the same angle to the upper optical pattern layer and the lower optical pattern layer, that is, the array lens of the line and the lower optical pattern layer in the direction in which the array lenses of the upper optical pattern layer are arranged. It is shown that the moiré phenomenon occurs when the lines in the direction in which the are arranged in parallel are formed.

Referring to FIG. 18B, when the cone-shaped array lens is formed on the upper optical pattern layer and the prism is formed on the lower optical pattern layer, the moir phenomenon due to the phase difference between patterns is avoided. It is showing what it does.

Such optical sheets include two or more functional sheets that adjust optical properties as needed. The functional sheet is bonded using an adhesive, in which the part directly contacting the adhesive is the pattern portion of the lower sheet.

Since the optical pattern of the lower sheet is in direct contact with the adhesive, it plays an important role in the adhesive force of the optical sheet. In order for the optical pattern of the lower sheet to combine with the adhesive to achieve a certain level of physical properties, the optical pattern other surface property should have a TACKY property.

As shown in FIG. 19, in the optical sheet according to the present invention, the upper optical pattern layer 110 and the lower optical pattern layer 120 may be laminated using the UV curable adhesive 200. At this time, since the adhesive is outside the limit that can control the adhesive force only when the adhesive is applied to the adhesive resin (tacky resin) to the optical pattern of the lower optical pattern layer 120.

Various materials may be used as the adhesive resin applied to the optical pattern of the lower optical pattern layer 120. Such adhesive resins may be, for example, thermally curable resins such as acrylic resins, urethane resins, polyester resins, or epoxy acrylate resins, urethane acrylate resins, and silicone acrylate resins when formed using heat treatment or ultraviolet irradiation. Ultraviolet curable resins such as the like, and the like.

In particular, the adhesive resin is preferably a UV reactive acrylate resin, and may be combined with resins of various molecular weights, for example, urethane acrylate, polyester acrylate, epoxy acrylate resin, and silicone acrylate resin. Relatively high molecular weight resins such as O-Phenylphenol EO Acrylate, 2- [Phenyl [thio] ethyl Acrylate, Benzyl Acrylate, Isodecyl Acrylate, Carprolactone Acrylate, Phenol Acrylate, Steatyl Acrylate, Hexanediol Raw materials such as low molecular weight bifunctional resins such as Diacrylate, Butanediol Diacrylate, Bisphenol A Diacrylate, Polyethylene glycol Diacrylate, Bisfluorene Diacrylate, Bisphenol Fluorene Diacrylate, and other UV reactive photoinitiators and additives can be variously formulated in liquid form.

In addition, the material constituting the adhesive is not limited to these materials can be applied in various ways.

The properties of the optical sheet implemented using such an adhesive resin are shown in Table 1 below. Here, the degree of adhesion is the same as A <B <C <D <E and all other experimental conditions were applied in the same manner.

TABLE 1

Here, the optical properties and peel force of Table 1 indicate that the smaller the value, the better the characteristics. Looking at these results, it can be seen that as the degree of adhesion of the adhesive resin increases, the optical properties, peeling force of the optical sheet implemented using the adhesive resin is better.

In addition, a filler resin may be applied to the optical patterns of the upper optical pattern layer and the lower optical pattern layer constituting the optical sheet according to the present invention in order to improve the brightness.

For example, O-phenylphenoxy ethyl Acrylate (OPPEA) dispersed inorganic fillers are added to the high refractive resins that are being mass-produced, thereby improving the luminance by overcoming the limit of luminance that can be increased by the refractive index of the resin. have.

The embodiments described above are just an example, and various modifications and changes may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims

An upper optical pattern layer formed on the upper portion of the optical pattern at a predetermined interval; And

A lower optical pattern layer formed below the upper optical pattern layer and formed to have an optical pattern layer having a predetermined shape disposed thereon at regular intervals;

It includes, but the horizontal direction or the vertical direction in which the optical pattern of the lower optical pattern layer corresponding to the horizontal direction or the vertical direction in which the optical pattern of the upper optical pattern layer is arranged at regular intervals are arranged at regular intervals Optical sheet for a backlight unit, characterized in that it is formed to have a line and a predetermined tilting angle of.
The method of claim 1,

The optical pattern is an optical sheet for a backlight unit, characterized in that any one of a hemispherical lens, a cone-shaped lens, a prism.
The method of claim 2,

And the optical pattern formed on the upper optical pattern layer and the optical pattern formed on the lower optical pattern layer have the same shape.
The method of claim 3, wherein

And the diameter or height of the optical pattern formed on the upper optical pattern layer and the diameter or height of the optical pattern formed on the lower optical pattern layer are the same.
The method of claim 3, wherein

The optical sheet for the backlight unit, characterized in that the diameter or height of the optical pattern formed on the upper optical pattern layer and the diameter or height of the optical pattern formed on the lower optical pattern layer are different.
The method of claim 1,

For each of the upper optical pattern layer or the lower optical pattern layer, a predetermined optical pattern is arranged at regular intervals, and an auxiliary optical pattern is arranged in a predetermined arrangement between the optical patterns. Optical sheet.
The method of claim 6,

The auxiliary optical pattern is an optical sheet for a backlight unit, characterized in that at least one or more optical patterns are formed in a modified or combined size.
The method of claim 6,

The auxiliary optical pattern is an optical sheet for a backlight unit, characterized in that at least one of the diameter or height is formed larger than the optical pattern.
The method of claim 1,

The optical sheet for the backlight unit, characterized in that the adhesive resin having a predetermined degree of adhesion is added to the optical pattern formed on the lower optical pattern layer.
The method of claim 1,

Filler resin is added to the optical pattern formed in the said upper optical pattern layer or the said lower optical pattern layer, The optical sheet for the backlight unit characterized by the above-mentioned.
The method of claim 2,

And the optical pattern formed on the upper optical pattern layer and the optical pattern formed on the lower optical pattern layer have different shapes.
The method of claim 11, wherein

A cone-shaped lens is formed on the upper optical pattern layer, and a prism is formed on the lower optical pattern layer.
The method of claim 11, wherein

For each of the upper optical pattern layer or the lower optical pattern layer, a predetermined optical pattern is arranged at regular intervals, and an auxiliary optical pattern is arranged in a predetermined arrangement between the optical patterns. Optical sheet.
The method of claim 13,

The auxiliary optical pattern is an optical sheet for a backlight unit, characterized in that at least one or more optical patterns are formed in a modified or combined size.
The method of claim 13,

The auxiliary optical pattern is an optical sheet for a backlight unit, characterized in that at least one of the diameter or height is formed larger than the optical pattern.
The method of claim 11, wherein

The optical sheet for the backlight unit, characterized in that the adhesive resin having a predetermined degree of adhesion is added to the optical pattern formed on the lower optical pattern layer.
The method of claim 11, wherein

Filler resin is added to the optical pattern formed in the said upper optical pattern layer or the said lower optical pattern layer, The optical sheet for the backlight unit characterized by the above-mentioned.
The method of claim 1,

The preset tilting angle is set to 6 to 8 ° when the diameter of the optical pattern formed on each of the upper optical pattern layer and the lower optical pattern layer is 16 to 25㎛. .
The method of claim 1,

The preset tilting angle may be set to 6 to 18 ° when the diameter of the optical pattern formed on each of the upper optical pattern layer and the lower optical pattern layer is 26 to 35 μm. .
The method of claim 1,

The preset tilting angle may be set to 20 to 25 ° when the diameter of the optical pattern formed on each of the upper optical pattern layer and the lower optical pattern layer is 36 to 45 μm. .
An upper optical pattern layer formed such that a hemispherical or cone-shaped lens is disposed at regular intervals; And

A lower optical pattern layer formed under the upper optical pattern layer, the upper optical pattern layer having a hemispherical or cone shape lens disposed at regular intervals;

A horizontal or vertical line in which the lenses of the lower optical pattern layer are arranged at regular intervals with respect to the horizontal or vertical lines in which the lenses of the upper optical pattern layer are arranged at regular intervals; And an optical sheet for the backlight unit, wherein the optical sheet is formed to have a preset tilting angle.
An upper optical pattern layer formed on the upper portion of the lens having a cone shape at regular intervals; And

A lower optical pattern layer formed on a lower portion of the upper array lens sheet, wherein the lower optical pattern layer is formed such that prisms are disposed at regular intervals thereon;

A horizontal or vertical line in which prisms of the lower optical pattern layer are arranged at regular intervals based on horizontal or vertical lines in which lenses of the upper optical pattern layer are arranged at regular intervals; And an optical sheet for the backlight unit, wherein the optical sheet is formed to have a preset tilting angle.